Propeller for flying machines



J. E. FOWLER PROPELLER FOR FLYING MACHINES June 22 1926. 1,589,592

Original Filed Feb. 16 1925 IN VEN TOR JEFOZUZer Zl/ZUQLWNYM A TTORNEYS.

Patented June 22, 1926.

' UNITED STATES JOHN ELLIS FOWLER, OF-MOBILE, ALABAMA.

PROIELLER FOR FLYING MACHINES.

Original application filed February 16, 1925, Serial No. 9,693. Divided and this application filed July 7,

1925. Serial No. 42,067.

The present invention relates to improvements in propellers for flying machines and the present application is a division of my co-pending application filed February 16, 1925, Ser. No. 9,693, and entitled Flying machine.

This invention has for an object to provide an improved propeller-in which great pulling effect is secured with less speed of the motor.

With the foregoing and other objects in view, the invention will be described in detail hereinafter, and referred to more particularly in the sub-joined claim.

The invention will be described in connection with the accompanying drawings, in which like parts are referred to by the same reference characters, and in which Fig. 1 is a front elevation of. an improved propeller constructed according to the present. invention;

Fig. 2 is a plan view of the same with the blades shown in normal condition; and

'Fig. 3 is a similar View, showing the blades in a partially straightened condition.

Referring more particularly to the drawings, the improved form of propeller is shown as mounted upon the engine or pro- 5 peller shaft 107. The propeller is shown as consisting of two vanes or blades extending in diametrically opposite directions from the shaft. The blade is composed of a number of sheets or laminations, in the embodiment shown in the drawings, three such sheets or laniinations 108, 109 and 110; These h'nn uations are secured at their forward ends. with reference to the direction of rotation of the propeller, to plates 111 and 112 extending in diametrically opposite directions from the propeller Shaft. The

"sheets or laminations are of spring steel or other elastic material, and the same are graduated in width from the outermost plate 108 to the innermost 110. The plates 108 and 109 act as backings for the plate 110, which is curved inwardly at its free end.

' The free end of the intermediate plate may also be curved to some extent if desired, and in a similar way the free end of the curved, similar to Fig. 2. Then, when the n motor is started, the faster the motor runs,

the more the blades straighten out, and when the motor is running at full speed, and the flying machine standin still, the blades are the straightcst, but as the machine begins to move forward, the faster the speed of the {tying machine, the more the blades begin to curve. When the machine attains a speed of say one hundred miles an hour, the blades will assume a curvature approaching their normal condition. The purpose of the arrangement is to give greater pulling effect in the propeller with less speed in the motor, when going at a fast speed, in order to reduce wear in the motor. By the re duced speed of the motor, the noise usually attended therewith, is largely eliminated.

It is obvious that various changes and modifications may be made in the details of construction and design of the above specifirally described embodiment of this invention without departing from the spirit thereof, such changes and modifications being restricted only by the scope of the following claim What is claimed is:

A propeller for flying machines comprising vanes, and plates secured to the vanes at their forward edges with reference to the direction of rotation, said plates being of varying circumferential width and said plates being curved circumferentially, the widest plate having an end projecting beyond the next widest plate and having such projecting end extending in a more accentuated curvature than the overlapped portion of said widest plate.

JOHN ELLIS FOWLER. 

